TMPDIR=/tmp/$USER
MAILDIR=$TMPDIR/procmail.out
DEFAULT=$MAILDIR/$USER
VERBOSE=yeah
SHELL=/bin/sh

:0
* ? test -d $TMPDIR || mkdir $TMPDIR
* ? test -d $MAILDIR || mkdir $MAILDIR
{ }
:0E
{
    # Bail out if either directory didn't exist and couldn't be created
    EXITCODE=127
    HOST
}

# ... your experimental recipes here